<template>
    <div class="cmt-container">
        <h3>发表评论</h3>
        <hr>
        <textarea placeholder="请输入要评论的内容(最多120个字)" maxlength="120" v-model="msg"></textarea>
        <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>
        <div class="cmt-list">
            <div class="cmt-item" v-for="(item,i) in comments" :key="item.id">
                <div class="cmt-title">
                    第{{i+1}}楼&nbsp;&nbsp;用户:{{item.user_name}}&nbsp;&nbsp;发表时间{{item.add_time|dateFormat}}
                </div>
                <div class="cmt-body">
                    {{item.content === 'undefined'?'此用户很懒,什么都没说':item.content}}
                </div>
            </div>
        </div>
        <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
    </div>
</template>
<script>
import {Toast} from 'mint-ui'

export default {
    data(){
        return {
            pageIndex:1 ,//默认展示第一页数据
            comments:[], //所有的评论数据
            msg:''//评论输入的内容
        }
    },
    created(){
        this.getComments()
    },
    methods:{
        getComments(){
            this.$http.get('api/getComments/'+this.id+'?pageindex='+this.pageIndex).then(result=>{
                if(result.body.status === 0){
                   // this.comments = result.body.message
                   this.comments = this.comments.concat(result.body.message);
                }else{
                    Toast('获取评论失败!')
                }
            })
        },
        getMore(){
            this.pageIndex++;
            this.getComments();
        },
        postComment(){
            // 校验是否为空内容
            if(this.msg.trim().length ===0){
                return Toast("评论内容不能为空!");
            }
            //发表评论
            //参数1: 请求的URL
            //参数2: 提交给服务器的数据对象{content:this.msg}
            //参数3: 定义提交时候,表单中数据的格式 {emulateJSON:true}  (可以先全局定义,不用每次都写)
            this.$http.post('api/postcomment/'+ this.$route.params.id,{content:this.msg.trim()})
            .then(function(result){
                if(result.body.status === 0){
                    //1 拼接出一个评论对象
                    var cmt = {user_name:'匿名用户', add_time:Date.now(), content:this.msg.trim()};
                    this.comments.unshift(cmt);
                    this.msg = "";
                }
            })
        }
    },
    props:["id"]
}
</script>
<style lang="scss" scoped>
.cmt-container{
    h3{
        font-size: 18px;
    }
    textarea{
        font-size: 14px;
        height: 85px;
        margin: 0;
    }
    .cmt-list{
        margin: 5px 0;
        .cmt-item{
            font-size: 13px;
            .cmt-title{
                line-height: 30px;
                background-color:#ccc;
            }
            .cmt-body{
                line-height: 35px;
                text-indent: 2em;
            }
            
        }
    }
}
</style>

